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Definition of wormer in US English:

wormer

noun

A substance administered to animals or birds to expel parasitic worms.

‘the grit contains a wormer’

‘In the case of meat, the animals must not be given medicine such as antibiotics or wormers, and they must feed on pesticide-free food.’

‘Finch also rotates his wormers including Ivomec ®, Safeguard ® and Valbazen ® annually so resistance doesn't build up in the herd.’

‘In other cases it's been shown that veterinary wormers can kill invertebrate insects that are really critical for dung removal.’

‘It would mean that anyone involved in rearing farm livestock or horses would no longer be able to purchase routine medical treatments such as antiseptics, vaccines and wormers without getting a vet to prescribe them.’

‘If not removed, the eggs are eventually ingested as the horse nuzzles its legs and can cause problems, even death, if the horse isn't given a wormer that kills bots.’

‘Animals are reared without the routine use of drugs, antibiotics and wormers common in intensive livestock farming.’

‘But he said that under the changes the minister was proposing farmers would have to get a vet prescription for items such as wormers, lice treatments, sheep dip and vaccines.’

‘Some people claim that wormers make a difference in their horse's hoof quality.’

‘All the animals were treated with wormers, lice powder and antibiotics and had injections for lice infestation.’

‘These are now being sponsored by the animal health company Bayer, which makes a leading brand of dog wormer.’

‘Harper told dining service employees that to raise meat for the cooperative, the animals' diet must be 85% grass-based, and farmers cannot use any chemical wormers, hormones or antibiotics.’

‘And if organic farmers really don't use wormers or antibiotics when the animals are diseased, then this says little for animal welfare concerns.’

‘At present, some 3,000 people across Britain who have completed comprehensive training in the composition, storage and use of veterinary medicines can sell animal medicines such as wormers to farmers.’